All reasonable precaution shall be taken against fire, and provisions shall be made so that water lines shall be available for use at all times. Fire hose connections with hose connected shall be installed in all power plants and work houses. There shall be fire hose connections within reasonable distance of all caissons. Fire hose shall be connected at either side of a tunnel bulkhead, with at least fifty feet of hose with nozzle connection. Water lines shall extend into each tunnel with hose connections every two hundred feet and shall be kept ready for use at all times.